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Illegal and pirate fishing take place in many parts of the world.Prof Callum Roberts, at the University of York in the UK and not part of Pauly's team, said: "We can see more clearly now, for example, the immense value of fish to poor people in developing countries," he said.Paleczny and Hammil's research found that the tern family has fallen by 85%, frigatebirds by 81%, petrels and shearwaters by 79%, and albatrosses by 69%.Lascelles said: "Increased efforts should be made to rid seabird colonies of invasive species, reduce bycatch in fisheries or the ensnaring of birds in fish nets, and setting up conservation areas." Paleczny also called for the creation of international marine protected areas to cover the wide ranges of seabirds.It gives us an idea of the overall impact we're having." There are nearly 350 species of seabirds worldwide.

Hammill said the "most pressing issue" is plastic pollution.

All of these activities need investment and support of governments around the world to make them happen," Lascelles said.

"These actions will build resilience in the seabird populations in the short term, which they need in the face of emerging threats such as climate change." Scientists call it Atlantic Meridional Overturning Circulation (AMOC).

But now seabirds seabird abundance has dropped 69.7% in only 60 years, according to a recent paper in PLOS ONE.

Edd Hammill with Utah State University and co-author of the paper, noted: "What we should take away from this is that something is serious amiss in the oceans." Ben Lascelles, with Birdlife International, found the research alarming because the decline appeared practically indiscriminate, hitting a "large number of species across a number of families." Michelle Paleczny with the University of British Columbia and the Sea Around Us Project said: "When we see this magnitude of seabird decline, we can see there is something wrong with marine ecosystems.

Seafood is the critical source of protein for more than 2.5 billion people, but over-exploitation is cutting the catch by more than 1 million tons a year.